Electric-lamp fitting.



J. G. STEARNS.

ELECTRIC LAMP FITTING.

APPLICATION FILED MAR.18.1914.

Patented Oct. 27, 1914.

a p H m r the same time producin UNITED S JASON C. STEARNS, 0F

WORCESTER, MASSACHUSETTS.

ELECTRIC-LAMP FITTING.

Specification of Letters Patent.

Patented Oct. 27, 1914.

Application filed March 18, 1914. Serial No. 825,711.

To all whom it may concern:

Be it known that I, JASON C. STEAnNs, a citizen of the United States, residing at orce'ster, in the count of Worcester and State of Massachusetts, ave invented a new and useful Electric-Lamp Fitting, of which the following is a specification.

This invention relates to an electric lamp connection which, while capable of general use, is particularly adapted for automobile lamps. These lamps as generally made are provided with external drawn or spun-metal casings which serve as the frame-work for the lamp, support the reflector and other external. parts, and also in one of the systems serve to constitute one terminal, being metallically connected with the chassis or frame of the car. These casings have to be perforated and .a connector inserted and as this has been done heretofore after the easings have been lacquered and treated by heat so as to fix the lacquer or other finish to the surface, it has been a matter of some dithculty and expense to provide a neat appearing 'oint where the bushing is secured to the l amp frame. It will be understood, of course, that these connectors ordinarily are made up complete, containing the insulating parts and theelectrical connecting parts an are thenapplied to the casings. With this mode of manufacture, all the parts have to be finished before the joint is made and consequently the formation of the joint is a matter which takes considerable time and is expensive in the manufacture of these articles.

The principal object of this invention is to provide for reducin this expense and at an article which has a more thoroughly nished appearance on the outside. treating the outside portion or bushlng of the electrical connector as a separate unit and inte rally uniting it to the casing of the lamp be ore the other parts are applied to it so that the joint can be formed in the ordinary metal workin ways and the finish on the outside ap lied to these two parts simultaneously so t at it will cover the joint. After this the other parts of the connector are applied and assembled, which can be done in such a way as not to interfere with the finish that has been applied.

Reference is to be had to the accompanydrawings in which,

igure 1 is a longitudinal, central, sec- This is accomplished by 1 tional View, with parts shown in elevation, showing a threo-wire connector arranged in accordance with this invention, and Fig. 9 is a central, sectional view of a portion of the casing and one-wire connector arranged also in accordance with this invention.

form shown in Fig. 1, the lamp itself comprises a spun-metal casing a receiving a reflector 7) inside, which supports a pair of lamp sockets c and (Z for a main lamp 6 and an auxiliary lamp f, the purposes of which lamps are well understood. n this case the first step in assembling the casing a and the bushing g which constitutes a part of the electrical connector after these parts are themselves made up, is to perforate the casing a, insert the bushing g and brazo them to ether so that they are integrally connected. It is understood of course that at this time the bushing g is in its final form and that no metal working operations have to be performed upon it after it is brazed to-tho casing. This havingbeen done these parts, which are entirely of metal, are lacquered or otherwise treated to provide them with a finished surface, (shown at S in Fig. 2) and then baked or otherwise heat treated for the purpose of fixing the same thereon. In this way the external surface of the casing a and bushing g are provided with one continuous finished coating. All irregularities at the brazed joints are covered and sealed by this coating so that the brazing of the joint is a much less delicate operation than has been the case heretofore. This having been done, an insulating block it is removably inserted in the inner end and connected up with ferrules j and conductors It.

The details of the connector shown in Fig. are not gone into in detail for the reason that I prefer to describe the details of a onewire connection as shown in Fig. 2. In this case the bushing G is brazed to the casing A as described in connection with Fig. 1. The inner end of the bushing G being screwthreaded, an insulating block H is inserted having thereon a rod L which extends through a perforation in the center of the block. This block H is readily removable from the inside by unscrewing it. This rod is provided with a head at its outer end and a spring M is arranged under the head to hold the rod in its'outermost position normally. The inner end of this rod is screwthreaded-so thatit can be applied to a ferrule 0, shown as of metal, into which the end of one of the conductors K extends. lnorder' to fasten the conductor firmly in the ferrule O and also to secure it to the rod L which serves as one terminal of this connector, the rod is screwed through a perforation in the ferrule against the end of the conductor. In this way the conductor is held firmly to the rod and operates with it. This form of connector is used in connection with a plug P of insulating material having a metallic socketQ for engaging the end of the rod L when the plug is inserted in the bushing G, and this lining Q constitutes the other terminal of the connector and is provided with a screw R leading to the conductor.

It will be understood of course that this invention can be used in connection with two-wire or four wire constructions and that other changes in relative arrangement of parts and details of construction can be made without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited in these respects but What I do claim is 1. The combination with a metal casing having a metallic bushing extending therethrough, of an insulating block removably mounted in the end of said bushing and having a perforation therethrough, a conducting rod extending through said perforation, a spring for yieldingly holding said rod in position, a contacting ferrule located transversely of said rod, and a conductor extending into said ferrule, said rod being secured in the ferrule for the purpose of securin it to the conductor and forming an electrical connection.

2. The combination with a metal casing having a metallic bushin extending therethrough, of an insulating lock in the inner end of said bushing and having a perforation therethrough, a conducting rod extending through sai perforation, a spring inside said bushing engaging said rod for holding said rod in its outermost position, a contacting ferrule located transversely of said rod, a conductor extending into said ferrule, said ferrule being movable with the rod, and a contacting plug-havin an insulating body adapted to fit wlthin said bushing and pro vided with a metal-lined socket in the end for engaging the head of said stud and forming an electrical contact therewith.

3. The combination with a thin metal (Qantas of this patent may he obtained for e a contacting casing having a metallic bushing extending therethrough and integrally united therewith, said bushing and casing havin a continuous surface coating fixed thereto y heat treatment, of an insulatin mounted in the end of sai ing a perforation therethrough, ing rod extending through said perforation, a spring for yieldingly holding said rod in position, a contacting ferrule located transversely of said rod, and a conductor extending into said ferrule, said rod being screwthreaded into the ferrule for the urpose of securing it to the conductor and orming an electrical connection.

4:. The combination with a thin metal casing having a metallic bushing extending therethrough and integrally united therewith,.said bushing and easing having a continuous surface coating fixed thereto by heat treatment, of an insulating block screwed into the inner end of said bushing and having a erforation therethrough, a conducting r extending through said perforation, a spring inside said bushing engaging, said rod for holding said rod in its outermost osition, a contacting ferrule located transversely of said rod inside the casing, a conductor extending into said ferrule, said rod being screw-threaded into the ferrule for the purpose of securing it to the conductor and forming an electrical connection, said ferrule being movable with the rod, and a contacting plu having an insulating body adaptedto t within said bushing and provided with a metal-lined socket llllihO end for engaging the head of said stud and forming an electrical contact therewith.

5. The combination with a metallic bushing, of an insulating block removablymounted in the end of said bushing and having a perforation therethrough, a conducting rod extending through said perforation, a spring for yieldingly holding said rod in position ferrule located transversely of said rod, and a conductor. extending into said ferrule, said rod being screw-threaded into the ferrule.

In testimony 'my hand, in the presence witnesses.

bushing and havwhereofl have hereunto set of two subscribing JASON o srnanns. Witnesses Ammo: E. FAY, Many E, ltnoan.

five cents each, by addressing the Gommissioncr of lretonta, Washington, 333.113.

a conductblock removably ice 

